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#include<cstdio>
int n,m,a=0,b,c=1,i,j,C[1001][1001],I[1001],J[1001];
char A[1001],B[1001],D[1001];
int main(){
scanf("%d",&b);
while(c<=b){
scanf("%d ",&n);
for(i=1; i<=n; i++)
A[i]=getchar();
scanf("%d ",&m);
for(i=1; i<=m; i++)
B[i]=getchar();
for(i=0; i<=n; i++)
C[i][0]=0;
for(j=1; j<=m; j++)
C[0][j]=0;
for(i=1; i<=n; i++)
for(j=1; j<=m; j++)
if(A[i]==B[j])
C[i][j]=C[i-1][j-1]+1;
else
if(C[i-1][j]>=C[i][j-1])
C[i][j]=C[i-1][j];
else
C[i][j]=C[i][j-1];
for(i=n,j=m;i>0 && j>0;){
if(C[i-1][j]==C[i][j])
i--;
else if(C[i][j-1]==C[i][j])
j--;
else{
D[a]=A[i];
I[a]=i;
J[a++]=j;
i--; j--;
};
};
if(C[n][m]<2) printf("case %d N",c);
else{
printf("case %d Y\n%d",c,C[n][m]);
for(i=C[n][m]-1; i>=0; i--)
printf("\n%c %d %d",D[i],I[i],J[i]);
};
printf("\n");
a=0;
c++;
};
return 0;
};
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