Task: Program Execution
Input (English): 1, 4, ['6997', 'j', '3659', 'X', 'D', 'V', 'j', 'Y', '2191', 'H', '5501', '5657', 'z', 'O', 'b', 'a', 'i', 'J', 'b', '333']
Output (English): 6997j3659X