#include <bits/stdc++.h>
#define rep(i,n) for(int i = 0; i < n; i++)
#define srep(i,a,b) for(int i = a; i < b; i++)
#define all(A) (A).begin(),A.end()
#define MOD 1000000007
using namespace std;
using ll = long long;
using P = pair<char,int>;
using Graph = vector<vector<int>>;

int main(void){
	string s; cin >> s;
	rep(i,26){
		if(s[i] != 'a'+i){
			cout << (char)('a'+i) << "to" << s[i];
			return 0;
		}
	}
}