FlandreScarle7/Codeforces-SolutionsA
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ShazidMahsrafi 2023-06-09 16:31:07 +06:00
parent 35c21ca554
commit ae0b3725a3
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110A Nearly Lucky Number/110A.cpp Normal file
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#include<bits/stdc++.h>
using namespace std;
int main()
{
long long n;
int count=0;
cin>>n;
while(n!=0)
{
if(n%10==4 || n%10==7) count++;
n=n/10;
}
if(count==4 || count==7) cout<<"YES"<<endl;
else cout<<"NO"<<endl;
}