Task: Program Execution
Input (English): 8937, 5759, 6363, X, L, 67, 5417, k, P, u, 4743, 6071, E, 1431, 2153, K, 3653, L, a, v, 3519
Output (English): 4, 5, 8, 9, 10, 13, 16, 18, 19, 20