Task: Program Execution
Input (English): MMgJWWXxijCbxlQSAYqnutASxCPJ, EOukFZliakWXxijCbxlQSAYqngHxnKZGNev
Output (English): a, b, c, e, f, g, h, i, j, k, l, n, o, q, s, u, v, w, x, y, z