def solution(s): s_arr = s.split(" ") result = "" for count in range(len(s_arr)): for idx in range(len(s_arr[count])): if idx % 2 == 0: result += s_arr[count][idx].upper() else: result += s_arr[count][idx].lower() result += "" if count == len(s_arr)-1 else " " return result