Exception Handling

How can I make my program not terminate if a letter is entered here? I am trying to restore the input stream but it's not working.

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#include <iostream>
#include <iomanip>
#include <string>

using namespace std;

int main()
{
	int choice;
	string str1 = "Please enter a number.";
	try
	{
		do
		{
			cout<<"\nTo do this, press 1."
				<<"\nTo do that, press 2."
				<<"\nTo do something, press 3."
				<<"\nTo do nothing, press 4."
				<<"\nTo exit, press 9."<<endl;
			cin>>choice;
			if(!cin)
			{
				throw str1;
				cin.clear();
				cin.ignore(100, '\n');
			}
			switch(choice)
			{
			case 1:
				break;
			case 2:
				break;
			case 3:
				break;
			case 4:
				break;
			default:
				cout<<"\nInvalid input.\n";
			}
		}while(choice != 9);
	}
	catch(string inp)
	{
		cout<<inp<<endl;
	}
	return 0;
}
Don't throw an exception. (remove line 23)
Doh! lol Thanks!
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