Task: Program Execution
Input (English): X, 9869, 7325, q, 6797, 29, s, I, y, c, 6981, 9993, f, 1385, Z, 8041, E, O, 2577, 2151
Output (English): 1, 4, 7, 8, 9, 10, 13, 15, 17, 18