Task: Program Execution
Input (English): 6157, O, 8867, 8041, 1771, I, 1569, C, l, 8475, G, 1053, j, W, 2703, C, O, 8745, D, 8573, o, c, Y
Output (English): 1, 3, 4, 5, 7, 10, 12, 15, 18, 20