TicTacToe_Invalid move

I cant get this tic tac toe program to recognize a move after its already been used. Also, the exit function is not working too great either, if you guys see a problem let me know. Any help would be appreciated, thanks!

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  #include <stdio.h>
#include <string.h>

char board[3][3] = {'1','2','3','4','5','6','7','8','9'};
char player = 'X';
int main();

void BOARD()                //Build tic tac toe board
{
    int i,j;
 printf("TIC-TAC-TOE\n");
for (i=0; i<3; i++)
    {for (j=0; j<3; j++)
        printf("%c ",board[i][j]);
        printf("\n");}
}


void Input()        //Read input by user
{
    int a, b, j, k;

            scanf("%i", &a);     

         if (a==1)
         {board[0][0] = player;}
         if (a==2)
         board[0][1] = player;
         if (a==3)
         board[0][2] = player;
         if (a==4)
         board[1][0] = player;
         if (a==5)
         board[1][1] = player;
         if (a==6)
         board[1][2] = player;
         if (a==7)
         board[2][0] = player;
         if (a==8)
         board[2][1] = player;
         if (a==9)
         board[2][2] = player;
        if (a>9)
            {printf("Out of range. Try Again!\n");
            return Input();}

}

/*int invalidmove()
{
    int i, j;
      for (i=0; i<3; i++)
        for(j=0; j<3; j++)
            {if (board[i][j]==player)
                return 1;}
        return 0;
}*/

void TOGGLE_PLAYER()
{

if (player=='X')
    player='O';
    else
        player = 'X';
}
int winner()        //check for a winner
{
    int i, j;
    //player X
    if (board[0][0] == 'X' && board[0][1] == 'X' && board[0][2] == 'X')
        return 1;
    if (board[1][0] == 'X' && board[1][1] == 'X' && board[1][2] == 'X')
        return 1;
    if (board[2][0] == 'X' && board[2][1] == 'X' && board[2][2] == 'X')
        return 1;
    if (board[0][0] == 'X' && board[1][0] == 'X' && board[2][0] == 'X')
        return 1;
    if (board[0][1] == 'X' && board[1][1] == 'X' && board[2][1] == 'X')
        return 1;
    if (board[0][2] == 'X' && board[1][2] == 'X' && board[2][2] == 'X')
        return 1;
    if (board[0][0] == 'X' && board[1][1] == 'X' && board[2][2] == 'X')
        return 1;
    if (board[0][2] == 'X' && board[1][1] == 'X' && board[2][0] == 'X')
        return 1;
    //player O
    if (board[0][0] == 'O' && board[0][1] == 'O' && board[0][2] == 'O')
        return 2;
    if (board[1][0] == 'O' && board[1][1] == 'O' && board[1][2] == 'O')
        return 2;
    if (board[2][0] == 'O' && board[2][1] == 'O' && board[2][2] == 'O')
        return 2;
    if (board[0][0] == 'O' && board[1][0] == 'O' && board[2][0] == 'O')
        return 2;
    if (board[0][1] == 'O' && board[1][1] == 'O' && board[2][1] == 'O')
        return 2;
    if (board[0][2] == 'O' && board[1][2] == 'O' && board[2][2] == 'O')
        return 2;
    if (board[0][0] == 'O' && board[1][1] == 'O' && board[2][2] == 'O')
        return 2;
    if (board[0][2] == 'O' && board[1][1] == 'O' && board[2][0] == 'O')
        return 2;
for (i=0; i<3; i++)
    for(j=0; j<3; j++)
    if(board[i][j]!='X' && board[i][j]!='O') return 0;
      return 3;
}
int exit()          //exit function
{
    int i, j;
    char a;
    printf("Do you want to play again? Y/N\n");
    getchar();
    scanf("%ch", &a);

    if (a=='Y' || a=='y')
       {main();}
    if (a=='N' || a=='n')
        {return 0;}
    if (a!='Y' || a!='y' || a!='N' || a!='n')
        {printf("Invalid entry...\n");
            return exit();}
else
        return 0;
}


int main()
{
int a;

printf("Select an option:\n");
printf("\n1. One player\n");
printf("2. Two players\n");
printf("3. HELP\n");
printf("4. Exit\n\n");
scanf("%i", &a);

if (a==1)
    printf("WORK IN PROGRESS\n");


if (a==2)
{
BOARD();
while(1)
{
Input();
BOARD();
if (winner() == 1)
    {printf("X wins!\n");
        exit();break;}
if (winner() == 2)
    {printf("O wins!\n");
        exit();break;}
if (winner() == 3)
    {printf("Draw!\n");
        exit();break;}
TOGGLE_PLAYER();
}
}


if (a==3)
    {printf("\nTICTACTOE:\nTry to get your icon (X or O) in a row of 3 to win.\nA game in which both players fail to get their icon in a row will result\nin a draw. (Press ENTER to continue)\n");
    getchar();
    getchar();
    return main();}


if (a==4)
{
}
if (a>4)
{printf("Not an option try again.\n");
return main();}


return 0;}
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