#include <stdio.h>
#include <locale.h>
#include <wchar.h>

static const wchar_t *weeks[] = {L"воскресенье", L"понедельник", L"вторник", L"среда", L"четверг", L"пятница", L"суббота"};

int weekday(int year, int month, int day) {
    (month < 3) ? (--year, month += 10) : (month -= 2);
    return (day + 31 * month / 12 + year + year / 4 - year / 100 + year / 400) % 7;
}

int main(void) {
    setlocale(LC_ALL,"Russian");
    int day, month, year;

    scanf("%d.%d.%d", &day,&month, &year);
    int wd = weekday(year, month, day);
    wprintf(L"Это был%s %s ", wd == 3 || wd == 5 || wd == 6 ? L"а" : wd == 0 ? L"о" :  L"\0", weeks[wd]);
    return 0;
}