XOR operation leaves only uncommon characters in the ans variable
ans = a1 ^ a2 ; NEW_LINE i = 0 ; NEW_LINE while ( i < 26 ) : NEW_LINE INDENT if ( ans % 2 == 1 ) : NEW_LINE INDENT print ( chr ( ord ( ' a ' ) + i ) , end = " " ) ; NEW_LINE DEDENT ans = ans // 2 ; NEW_LINE i += 1 ; NEW_LINE DEDENT