#include <bits/stdc++.h>
using namespace std;
bool is_letter(char x) {
return ((x >= 'a' && x <= 'z') || (x >= 'A' && x <= 'Z'));
}
void reverse(char s[]) {
int right = strlen(s) - 1, left = 0;
while (left < right) {
if (!is_letter(s[left]))
left++;
else if (!is_letter(s[right]))
right--;
else {
swap(s[left], s[right]);
left++;
right--;
}
}
}
int main()
{
char s[] = "a#b$%c&*(def!";
reverse(s);
cout << s;
return 0;
}
/*
run:
f#e$%d&*(cba!
*/