Task: Program Execution
Input (English): K, A, c, J, k
Output (English): [['K', 'A', 'c', 'J'], ['K', 'A', 'c', 'k'], ['K', 'A', 'J', 'k'], ['K', 'c', 'J', 'k'], ['A', 'c', 'J', 'k']]