Task: Program Execution
Input (English): l, 1411, 7923, t, y, 1707, H, K, V, 1281, 3823, 2711, s, 7859, m, m, 4647, t, a, P, h, 3071, 6667
Output (English): 1, 4, 5, 7, 8, 9, 13, 15, 16, 18, 19, 20, 21