include <bits/stdc++.h>

using namespace std;

const int MAX_CHAR = 26;

void findAndPrintUncommonChars(string str1, string str2) {

int present[MAX_CHAR];
for (int i=0; i<MAX_CHAR; i++)
    present[i] = 0;

int l1 = str1.size();
int l2 = str2.size();


for (int i=0; i<l1; i++)
    present[str1[i] - 'a'] = 1;

// for each character of str2
for (int i=0; i<l2; i++)
{

    if (present[str2[i] - 'a'] == 1
        || present[str2[i] - 'a'] == -1)
        present[str2[i] - 'a'] = -1;


    else
        present[str2[i] - 'a'] = 2;
}


for (int i=0; i<MAX_CHAR; i++)
    if (present[i] == 1 || present[i] == 2 )
        cout << (char(i + 'a')) << " ";

}

// Driver program to test above int main() { string str1 = "characters"; string str2 = "alphabets"; findAndPrintUncommonChars(str1, str2); return 0; }