#include<stdio.h>
#include<string.h>
int p1, p2, r1, r2, p11, p22, r11, r22, i, j, n, d1, d2, k;

char s;

int main()
{
    scanf("%d:%d", &p1, &p11);
    scanf("%d:%d", &p2, &p22);
    scanf("%d:%d", &r1, &r11);
    scanf("%d:%d", &r2, &r22);
    
    
    if ( (p1<p2) && (r1<r2) ) k=1;
    if ( (p1>p2) && (r1>r2) ) k=1;
    
    for(;;){
            p1=p1+r1;
            if (p1>=24) { p1=p1-24; d1++ ;}
            p2=p2+r2;
            if (p2>=24) { p2=p2-24; d2++ ;}
            if (p1==p2) break; }
    
    if (k==1) printf("nikad"); 
    else {        
            
    if(d1%7==0) printf("subota");
    if(d1%7==1) printf("nedjelja");
    if(d1%7==2) printf("ponedjeljak");
    if(d1%7==3) printf("utorak");
    if(d1%7==4) printf("srijeda");
    if(d1%7==5) printf("cetvrtak");
    if(d1%7==6) printf("petak");
            
    printf("\n%d:00", p1);}
            
    
    
    
    
    
    return 0;
}