Submission #1777330

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Source Code Expand

#include<iostream>
#include<string>
using namespace std;
int main(){
  string s;
  cin>>s;
  int ia;
  int cou=0;
  string fi("abcdefghijklmnopqrstu");
  for(int i=0;i<fi.size();i++){
    if(s.find(fi[i])==-1){
      ia=i;
      break;
    }else{
      cou++;
    }
  }
  if(cou==fi.size()){
    cout<<"None"<<endl;
  }else{
    cout<<fi[ia]<<endl;
  }
  return 0;
}

Submission Info

Judge Result