#include<bits/stdc++.h>
using namespace std;
typedef long long ll;
#define F first
#define S second
#define pii pair<int, int>
#define eb emplace_back
#define all(v) v.begin(), v.end()
#define rep(i, n) for (int i = 0; i < n; ++i)
#define rep3(i, l, n) for (int i = l; i < n; ++i)
#define chmax(a, b) a = (a >= b ? a : b)
#define chmin(a, b) a = (a <= b ? a : b)
#define out(a) cout << a << endl
#define outa(a, n) rep(_, n) cout << a[_] << " "; cout << endl
#define SZ(v) (int)v.size()
#define inf (int)(1e9+7)
#define abs(x) (x >= 0 ? x : -(x))

string diff(string s, string t) {
    string ret;
    rep(i, SZ(s)) if (s[i] != t[i]) ret += s[i];
    return ret;
}
int main() {
    ios::sync_with_stdio(false);
    cin.tie(0);
    string ans = "yukicoder";
    string str;
    cin >> str;
    out(diff(ans, str));
}