#include <iostream>
#include <string.h>
 
using namespace std;
 
int main ()
{
    char s[100];
 
    cout << "The string is: " << endl;
    cin.get(s, 100);
 
    int len = strlen(s);
    for (int i = 0; i < len; i++) {
        if (s[i] == 'a') {
            if ((len+3) > sizeof(s)) break; // no more space!
            memmove(s+(i+3), s+(i+1), sizeof(s)-(i+1));
            s[i+1] = 'a'; s[i+2] = 'a';
            i += 2;
            len += 2;
        }
    }
 
    cout << "The modified string  is: " << endl;
    cout << s;
}

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

d2F0ZXI=

water