Codeforces 110A Nearly Lucky Number solution in CPP
#include<bits/stdc++.h> using namespace std; int main() { string a; int c=0,z=0; cin>>a; for(int i=0;i<a.size();i++) { if(a[i]=='4'||a[i]=='7')//Codeforces 110A Nearly Lucky Number solution in CPP c++; } if(c==4||c==7) cout<<"YES"<<endl; else cout<<"NO"<<endl; }
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