#include<bits/stdc++.h>

using namespace std;
using ll = long long;


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