Task: Program Execution
Input (English): 7831, i, 9021, 1705, d, 3103, 3867, 5143, G, P, x, W, Z, Q, W, c, x, U, 1557, t, 311, 5781, U
Output (English): 2, 5, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 20, 23