Task: Program Execution
Input (English): 1, 21, ['P', '4213', '757', 'x', 'K', 'u', '3033', '2133', 'h', '3361', '7613', 'c', 'L', '3675', 'B', 'R', 'x', '4171', 'W', 'f', '5213', '1669', 'Z', 'y', 'D', 'w', 'l', '7199', 'a']
Output (English): 3125fW1714xRB5763Lc31671633h33123303uKx7573124P