Task: Program Execution
Input (English): WtTxPgqARTvyWnttcDYrdBBiNcdfHffjX, kxcqARTvyWnttcDYrNJeFhAWUrailW
Output (English): a, b, c, d, f, g, h, i, j, n, p, q, r, t, v, w, x, y