Task: Program Execution
Input (English): 1249, D, 5451, 7307, c, Y, 6349, f, I, 261, z, B, 6493, l, 6119, 7753, s, 8541, 1951, X, 1053, O, W, 6993
Output (English): D, c, Y, f, I, z, B, l, s, X, O, W