#include <stdio.h>

//HH:MMa/p
i;f(char*p){i=atoi(p)%12+(p[5]^97?12:0);*p=i/10+48;p[1]=i%10+48;p[5]=0;}

int main(void) {
	// your code goes here
	char t1[] = "12:00a";
	char t2[] = "01:00a";
	char t3[] = "11:00a";
	char t4[] = "12:00p";
	char t5[] = "01:00p";
	char t6[] = "11:00p";
	f(t1); puts(t1);
	f(t2); puts(t2);
	f(t3); puts(t3);
	f(t4); puts(t4);
	f(t5); puts(t5);
	f(t6); puts(t6);
	return 0;
}