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s=[] for x in input():s+=[x];s=s[:s=(Nones+[x],s[:-21])[x<1]][x<1] print s
Try it online!Try it online!
s=[] for x in input():s+=[x];s=s[:(None,-2)[x<1]] print s
Try it online!
s=[] for x in input():s=(s+[x],s[:-1])[x<1] print s
