#include<stdio.h>
void main()
{int i=5;
void palin(int n);
printf("\40:");
palin(i);
printf("\n");
while(1);
}
void palin(int n)
{
char next;
if(n<=1)
{next=getchar();
printf("\n\0:");
putchar(next);
}
else
{next=getchar();
palin(n-1);
putchar(next);
}
}