#include <stdio.h>
int main() {
char arr[] = 'abcdef';
int sz = sizeof(arr)/sizeof(arr[0]);
int left = 0;
int right = sz-2;
while(left<right){
char tmp = arr[left];
arr[left] = arr[right];
arr[right] = tmp;
left++;
right--
}
printf("%d",arr);
return 0;
}