Task: Program Execution
Input (English): C, I, Y, E, I, N, t, j, 5615, r, D, 8537, o, M, 507, 5107, 6113, E, n, r, 2673, 8003, 5429
Output (English): 1, 2, 3, 4, 5, 6, 7, 8, 10, 11, 13, 14, 18, 19, 20