Task: Program Execution
Input (English): C, a, 4117, 6453, 5913, y, 6897, f, j, 1157, V, 6459, g, 2879, 1733, 4567, 1347, 4177, 8459, v, k, 3321, 1923
Output (English): C, a, y, f, j, V, g, v, k, 4117, 6453, 5913, 6897, 1157, 6459, 2879, 1733, 4567, 1347, 4177, 8459, 3321, 1923