#include<iostream>
#include<algorithm>
using namespace std;
char* Change(char *c,int num,int n) {
int i = 0, j = num - 1;
while (i < j) swap(c[i++],c[j--]);
i = num - n; j = num - 1;
while (i<j) swap(c[i++],c[j--]);
i = 0; j = num - n-1;
while (i < j) swap(c[i++],c[j--]);
return c;
}
int main() {
char l[] = "cdefgab";
cout<<Change(l,7,2)<<endl;
return 0;
}