Task: Program Execution
Input (English): 6121, 2263, O, g, a, 5937, 8051, 3557, n, 3755, s, R, p, y, x, 9701, 5669, x, 1975, M, Z, C
Output (English): 3, 4, 5, 9, 11, 12, 13, 14, 15, 18, 20, 21, 22