#include <bits/stdc++.h>
using namespace std;
int a[50] = {0};
int main(){
	long long n = 0;
	char b;
	cin >> n;
	for(long long i=1;i<=n;i++){
		cin >> b;
		a[i] = (int)b;
	}
	bool q = false;
	for(long long i=1;i<=n;i++){
		bool t = false;
		char d = a[i];
		for(long long j=i+1;j<=n;j++){
			if(a[j] == d){
				t = true;
				q = true;
			}
		}
		if(q == true){
			if(t == false){
				cout << i;
				break;
				break;
				break;
			}
		}
	}
	return 0;
}

20分求助，请问各位大佬，这个代码还有救吗？o(╥﹏╥)o