hdu 2133

#include<cstdio>
#include<string>
using namespace std;

int year, month, day;

string ans[7] = {"Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday"};
bool m[] = {false, true, false, true, false, true, false, true, true, false, true, false, true};

int main()
{    
    int sum = 0;
    while(~scanf("%d%d%d", &year, &month, &day))
    { 
        if((year == 0 || month == 0 || day == 0) || (month==2 && day>29) || (!m[month]&&day == 31) || (!((year%4==0 && year%100!=0) || year%400==0) && month==2 && day==29) ){
            puts("illegal");
            continue;
        }
        if(month < 3){
            year -= 1;
            month += 12;
        }
        int c = year/100 , y = year % 100;
        int w = c/4 - 2*c + y/4 + y + (26*(month+1)/10) + day -1;
        
        cout<<ans[(w%7+7)%7]<<endl;
    }
    return 0;

}