Task: Program Execution
Input (English): r, x, a, y, 7109, 6305, 8829, J, p, 5373, p, q, 7831, C, z, m, 4051, b, g, G, j
Output (English): 1, 2, 3, 4, 8, 9, 11, 12, 14, 15, 16, 18, 19, 20, 21