Problem:
Score : 100 points

Problem Statement

It is September 9 in Japan now.

You are given a two-digit integer N. Answer the question: Is 9 contained in the decimal notation of N?

Constraints

10≤N≤99

Input

Input is given from Standard Input in the following format:

N

Output

If 9 is contained in the decimal notation of N, print Yes; if not, print No.

Sample Input 1

29

Sample Output 1

Yes

The one's digit of 29 is 9.

Sample Input 2

72

Sample Output 2

No

72 does not contain 9.

Sample Input 3

91

Sample Output 3

Yes

Solution in C (Clang 3.8.0) (judge verdict: Wrong Answer)

#include <stdio.h>
int main(){
    int a;
    int b;
    int c;
    scanf("%d",&a);
    if(a>10){
        b=a%10;
        if(b==9){
            printf("YES\n");
            
        }
        else if((a-b)%9==0){
             printf("YES\n");
            
        }
        else{
             printf("NO\n");
            
        }
    }
   
    return 0;
}