Task: Program Execution
Input (English): 5623 7733 1967 5065 f 2709 7165 l 8245 f 3457 1687 8131 3819 1939 z 6425 1581 l 5083 5731 2573 j 9257 z 6963 6863 6289 a j x g y o v
Output (English): a, f, g, j, l, o, v, x, y, z