def count_duplic(lists): element = [] frequency = [] if not lists: return element running_count = 1 for i in range(len(lists)-1): if lists[i] == lists[i+1]: running_count += 1 else: frequency.append(running_count) element.append(lists[i]) running_count = 1 frequency.append(running_count) element.append(lists[i+1]) return element,frequency