题解 | #ZOJ#

m=input()
res={"Z":0,"O":0,"J":0}
for i in range(len(m)):
    if m[i]=="Z":
        res["Z"]+=1
    if m[i]=="O":
        res["O"]+=1
    if m[i]=="J":
        res["J"]+=1
ans=""
while res["J"]>0 or res["Z"]>0 or res["O"]>0:
    if res["Z"]>0:
        ans+="Z"
        res["Z"]-=1
    if res["O"]>0:
        ans+="O"
        res["O"]-=1
    if res["J"]>0:
        ans+="J"
        res["J"]-=1
print(ans)