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  1. #include <stdio.h>
  2. #include <string.h>
  3.  
  4. int main()
  5. {
  6.     int n , m , cnt;
  7.     char str[10000];
  8.     scanf("%s" , str);
  9.     for (int i = 0; str[i] != '\0'; i++)
  10.     {
  11.         if( str[i] == '4' || str[i] == '7' )
  12.         {
  13.             cnt++;
  14.         }
  15.     }
  16.     //printf("%d\n" , cnt);
  17.     if( cnt == 4 || cnt == 7)
  18.     {
  19.         printf("YES\n");
  20.     }
  21.     else
  22.     {
  23.         printf("NO\n");
  24.     }
  25.   	return 0;
  26. }
Success #stdin #stdout 0s 5464KB
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stdin
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Standard input is empty
stdout
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NO
https://ideone.com/uKtrng
language:
C (gcc 8.3)
created:
1 year ago
visibility:
public

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