Task: Program Execution
Input (English): BiQgytVMJHxARIXFBCPuhCAMJZtHqwKE, nDxjfxARIXFBCPuhzSqsqdqtIFV
Output (English): a, b, c, e, f, g, h, i, j, k, m, p, q, r, t, u, v, w, x, y, z