Task: Program Execution
Input (English): B, 7, k, 5, c, Q, 4
Output (English): [['B', '7', 'k', '5', 'c', 'Q'], ['B', '7', 'k', '5', 'c', '4'], ['B', '7', 'k', '5', 'Q', '4'], ['B', '7', 'k', 'c', 'Q', '4'], ['B', '7', '5', 'c', 'Q', '4'], ['B', 'k', '5', 'c', 'Q', '4'], ['7', 'k', '5', 'c', 'Q', '4']]