func_code_string: #include <bits/stdc++.h>   using namespace std;   const long long maxN = 1e6 + 5;   const long long inf = 1e10;   const long long mod = 1e9 + 7;   long long n;   long long ans = 1;   long long res[maxN];   void normalSieve(long long n) {     for (long long i = 1; i <= n; i++) res[i] = 1;     for (long long i = 2; i * i <= n; i++) {       if (res[i] == 1) {         for (long long j = i * i; j <= n; j += i) {           res[j] = 2;           ans = 2;         }       }     }   }   int main() {     ios_base::sync_with_stdio(0);     cin >> n;     normalSieve(n + 1);     cout << ans << endl;     for (long long i = 2; i <= n + 1; i++) cout << res[i] <<    ;     return 0;   }   