#include <stdio.h>
int main (void)
{
int x,y;
scanf("%d:%d",&x,&y);
y+=5;
if(y>=60)
{
x+=1;
y-=60;
if(x>=24)
{x-=24;}
}
if(x<10&&y<10)
printf("0%d:0%d¥n",x,y);
else if(x<10)
printf("0%d:%d¥n",x,y);
else if(y<10)
printf("%d:0%d¥n",x,y);
else
printf("%d:%d¥n",x,y);
return 0;
}