Task: Program Execution
Input (English): d, f, g, 4163, f, 6569, 1787, 311, o, l, i, f, 2675, 5777, t, 4505, b, j, 5573, 2807, 9225, 1859, 2609, u
Output (English): b, d, f, g, i, j, l, o, t, u