Task: Program Execution
Input (English): O, 6037, 3923, 1715, a, i, C, 413, 4443, 6791, 6647, 8361, 7241, r, 8981, Y, W, 7507, u
Output (English): O, a, i, C, r, Y, W, u, 6037, 3923, 1715, 413, 4443, 6791, 6647, 8361, 7241, 8981, 7507