Task: Program Execution
Input (English): B, 5121, 5063, x, F, W, 9117, Q, 4995, o, 1495, 1771, 4811, 7801, 1669, 6971, 9229, 5679, o, 4597, 8785, z, f
Output (English): 1, 4, 5, 6, 8, 10, 19, 22, 23