#include <bits/stdc++.h>
using namespace std;

int main()
{
	string s;
	cin >> s;

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

	cout << "correct" << endl;

	return 0;
}