import std;

void main () {
    string S = readln.chomp;
    const int N = S.length.to!int;

    string y = "yukicoder";
    const int M = y.length.to!int;

    int ans = 0;
    int l = 0, r = 0;
    while (l < N) {
        int cnt = 0;
        while (r < N) {
            if (S[r .. min(N, r + M)] != y) {
                break;
            }
            cnt++;
            r += M;
        }

        ans = max(ans, cnt);

        if (l == r) {
            l++;
            r++;
        }
        else {
            l = r;
        }
    }

    writeln(ans);
}

void read (T...) (string S, ref T args) {
    import std.conv : to;
    import std.array : split;
    auto buf = S.split;
    foreach (i, ref arg; args) {
        arg = buf[i].to!(typeof(arg));
    }
}