while True: I = (input().split())[1:] R = list(set(map(int, input().split()[1:]))) R.sort() res = [] for r in R: tmp = [] cnt = 0 for index,i in enumerate(I): if str(r) in i: cnt+=1 tmp.extend([str(index),i]) if cnt != 0: tmp.insert(0, str(cnt)) tmp.insert(0, str(r)) res.extend(tmp) print(str(len(re...