Task: Program Execution
Input (English): OuTfLIBgTkQKXyQkCctFpWYPNYXpa, hhbRzCqooReyIIBgTkQKXyQkCctFCHf
Output (English): b, c, e, f, g, h, i, k, o, q, r, t, x, y, z