#pragma GCC optimize("O3")
#include <bits/stdc++.h>
#define ll long long
#define rep(i,n) for(ll i=0;i<(n);i++)
#define pll pair<ll,ll>
#define pii pair<int,int>
#define pq priority_queue
#define pb push_back
#define eb emplace_back
#define fi first
#define se second
#define endl '\n'
#define ios ios_base::sync_with_stdio(0),cin.tie(0),cout.tie(0);
#define lb(c,x) distance(c.begin(),lower_bound(all(c),x))
#define ub(c,x) distance(c.begin(),upper_bound(all(c),x))

using namespace std;

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