# 20240912


s = input()
a = ''
for i in s:
    if i.isalpha():
        a += i
ss = sorted(a,key=str.upper)
#print(ss)
res = ''
idx = 0
for i in range(len(s)):
    if s[i].isalpha():
        res += ss[idx]
        idx += 1
    else:
        res += s[i]
print(res)