#include <stdio.h>
int main(void){
	int val = 0;
	scanf("%d",&val);
	
	int count = 0;
	 do {
        val /= 10;
        count++;
    } while (val > 0);

    if(count == 2){
    	printf("Yes");
    }else{
    	printf("No");
    }
}