class Solution {
public String solution(int a, int b) {
int sum = 0;
int[] date = {31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};
String[] day = {"THU", "FRI", "SAT", "SUN", "MON", "TUE", "WED"};
for (int i=0; i<a-1; i++) {
sum+=date[i];
}
return day[(sum+b)%7];
}
}