text: #include <bits/stdc++.h>
  using namespace std;
  typedef long long ll;
  
  string solve(string n) {
    for (char c : n) {
      if (c == '7') {
        return "Yes";
      }
    }
    return "No";
  }
  /*
  int main() {
    string n;
    cin >> n;
    cout << solve(n);
  }
  */