改一下，WA了

#include <bits/stdc++.h>
using namespace std;
long long n, a, sum;
int main(){
	cin >> n;
	for(int i=1; i<=n; ++i){
		cin >> a;
		while (a > 0) {
 		    sum += a % 10;
			a /= 10;
		}	
		if(sum % 7 == 0){
			cout << "Yes";	
		}			 
		else{
			cout << "No";
		}
	}
	return 0;
}