a = input().split()
k = dict()
l = []
b = str()
for i in a:
    j = i[1::]
    k[j] = i[0]
for key in k.keys():
    l.append(key)
j=sorted(l)
for i in range(len(j)):
        print(str(k[j[i]])+str(j[i]), end=' ')