head=1
link=[['C',3],['A',5],['F',6],['A',4],['E',2],['B',0],['C',-1]]
d=input()
p=head
flag=False
while p!=-1:
    if d==link[p][0]:
        if p==head:
            link.append(["AA",__________])
            head=len(link)-1
        else:
            link.append(["AA",__________])
            link[q][1]=len(link)-1
        __________
    __________
    __________
if not flag:
    link.append(["AA",-1])
    __________
p=head
while p!=-1:
    if link[p][1]!=-1:
        print(link[p][0],end="->")
    else:
        print(link[p][0])
    p=link[p][1]