/*
validation
*/

#include<bits/stdc++.h>
#include "testlib.h"

using ll = long long;

const ll n_min = 1, n_max = 100;

int main(){
    registerValidation();
    ll n = inf.readLong(n_min, n_max);
    inf.readEoln();
    for(int i = 0; i < n; i++) {
        char c = inf.readChar();
        if(i > 0) ensure('0' <= c && c <= '9');
        else ensure('1' <= c && c <= '9');
    }
    inf.readEoln();
    inf.readEof();
    return 0;
}