include <bits/stdc++.h>

using namespace std; int main() { int n; cin >> n; int n1 = n/10000; int n2 = n/1000%10; int n3 = n/100%10; int n4 = n/10%10; int n5 = n%10; if((n1 == n2) || (n1 == n3) || (n1 == n4) || (n1 == n5) || (n2 == n3) || (n2 == n4) || (n2 == n5) || (n3 == n4) || (n3 == n5) || (n4 == n5)) { cout << "YES"; } else { cout << "NO"; } }