Task: Program Execution
Input (English): l, X, D, W, 537, 4383, 4001, 8901, M, 5747, 3495, 5689, k, a, y, l, 5679, U, 1887, X, 3611, u
Output (English): 1, 2, 3, 4, 9, 13, 14, 15, 16, 18, 20, 22