row =3 col=4 #数据录入 a=[] for i in range ( 3 ): b = input().split() a.append(b) #遍历 ma=int(a[0][0]) for i in range(3): for j in range (4): if int(a[i][j])>ma: ma=int(a[i][j]) #数据输出 print(ma)