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people={}
for x in range(1,31):
    people[x]=1
# print(people)
check=0
i=1
j=0
while i<=31:
    if i == 31:
        i=1
    elif j == 15:
        break
    else:
        if people[i] == 0:
            i+=1
            continue
        else:
            check+=1
            if check == 9:
                people[i]=0
                check = 0
                print("{}号下船了".format(i))
                j+=1
            else:
                i+=1
                continue

9号下船了
18号下船了
27号下船了
6号下船了
16号下船了
26号下船了
7号下船了
19号下船了
30号下船了
12号下船了
24号下船了
8号下船了
22号下船了
5号下船了
23号下船了