#include <stdio.h>
#include <string.h>

enum a{sun,mon,tue,wed};

int main(){
    enum a d;
    
    char da[10];
    scanf("%s",da);
    
    if(!strcmp(da,"mon")){//here if takes mon and compares we get 0
        d=1;             //but as of not we get one and executes this
    }
    else if(!strcmp(da,"sun")){//by default the sun comes in this fn only
        d=0;
    }
    else if(!strcmp(da,"tue")){//so since the sting exacly comes to fn where its string present
        d=2;                   // we get the correct result
    }
    
    switch(d){
        case sun:
            printf("sunday");
            break;
        case mon:
            printf("monday");
            break;
        case tue:
            printf("tuesday");
            break;
    }
}