#include <stdio.h>
int main()
{
int y=0;
char a[100];
scanf("%s", a);
if(a[0]==a[2])
{
printf("");
}
/*
int * ptr1 = &a[0];
int * ptr2 = &a[5];
for(int f=0; f<3; f++)
{
y = *(ptr1+f);
*(ptr1+f) = *(ptr2-f);
*(ptr2-f) = y;
}
*/
printf("%s ", a);
}
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