Task: Program Execution
Input (English): 6869, 9905, 4879, 2237, 7579, 2143, C, U, c, U, q, K, 6435, z, B, 9817, X, D
Output (English): C, U, c, U, q, K, z, B, X, D, 6869, 9905, 4879, 2237, 7579, 2143, 6435, 9817