Algorithm


A. Nearly Lucky Number
time limit per test
2 seconds
memory limit per test
256 megabytes
https://codeforces.com/problemset/problem/110/A
input
standard input
output
standard output

Petya loves lucky numbers. We all know that lucky numbers are the positive integers whose decimal representations contain only the lucky digits 4 and 7. For example, numbers 47, 744, 4 are lucky and 5, 17, 467 are not.

Unfortunately, not all numbers are lucky. Petya calls a number nearly lucky if the number of lucky digits in it is a lucky number. He wonders whether number n is a nearly lucky number.

Input

The only line contains an integer n (1 ≤ n ≤ 1018).

Please do not use the %lld specificator to read or write 64-bit numbers in С++. It is preferred to use the cin, cout streams or the %I64d specificator.

Output

Print on the single line "YES" if n is a nearly lucky number. Otherwise, print "NO" (without the quotes).

Examples
Input
Copy
40047
Output
Copy
NO
Input
Copy
7747774
Output
Copy
YES
Input
Copy
1000000000000000000
Output
Copy
NO
Note

In the first sample there are 3 lucky digits (first one and last two), so the answer is "NO".

In the second sample there are 7 lucky digits, 7 is lucky number, so the answer is "YES".

In the third sample there are no lucky digits, so the answer is "NO".

 

Code Examples

#1 Code Example with C++ Programming

Code - C++ Programming

#include<iostream>
using namespace std;

int main(){
  long long n;
  cin>>n;
  int check = 0;
  int rem;
  while(n != 0){
    rem = n%10;
    n /= 10;
    if(rem == 7 || rem == 4){
      check++;
    }

  }
  if(check != 4 && check != 7){
    cout<<"NO";
  }
  else{
    cout<<"YES";
  }
  return 0;
}
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Input

x
+
cmd
40047

Output

x
+
cmd
NO
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Demonstration


Codeforces solution 110-A A. Nearly Lucky Number 110-A Nearly Lucky Codeforces solution

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