抄作业真香

str1 = input()
a = ''
for i in str1:
    if i.isalpha():
        a+=i 
b = sorted(a,key=str.upper)
c= ''
index = 0
for i in range(len(str1)):
    if str1[i].isalpha():
        c+=b[index]
        index+=1
    else:
        c+=str1[i]
print(c)