#28123: _CPP
11030067@mail.hpsh.tp.edu.tw
(和平110級鄧雨珊)
#include <iostream>
using namespace std;
int main(){
string s;
while (cin >> s){
if (s[0]=='0'){
break;
}
long long sum=0;
int sng=1;
for (int i=0; i<s.size(); i++){
sum+=sng*(s[i]-'0');
sng*=-1;
}
if (sum%11==0){
cout << s <<" is a multiple of 11.\n";
}
else {
cout << s <<" is not a multiple of 11.\n";
}
}
}