Task: Program Execution
Input (English): 6511, Y, 9477, 7007, R, j, 7189, 6547, 163, o, 2231, 8431, 5171, f, r, M, c, 2795, e, 7177, S, e, y, m
Output (English): 1, 3, 4, 7, 8, 9, 11, 12, 13, 18, 20