List = []
List2 = [str(i) for i in input().split()]
for j in List2:
    List.append(j[1])
List.sort()
for i in List:
    for j in List2:
        if (i == List[-1]):
            if (j[1] == i): print(j)
        elif (j[1] == i): print(j, end=' ')