sum - remove last occuring zero



z=int(input())

d=list(map(int,input().split()))

g=0

for i in d:

    t='';flag=1

    for j in str(i)[::-1]:

        if j=='0' and flag==1:

            flag=0

            continue

        else:

            t+=j

    g+=int(t[::-1])

print(g)


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