Submission #933990

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Source Code Expand

#include<iostream>
#include<string.h>
#include<string>
#include<cstdio>
#include<algorithm>
#include<stack>
#include<queue>
#include<vector>
#include<cmath>
#include<utility>
#include<set>
#define ll long long int
#define ld long double
#define INF 1000000000
#define EPS 0.0000000001
#define rep(i,n) for(i=0;i<n;i++)
using namespace std;
typedef pair<int, int> P;

int main()
{
  string str;
  cin>>str;
  if(str[0]=='a' && str.size()==1)
    cout<<"-1"<<endl;
  else
    cout<<"a"<<endl;
}

Submission Info

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