1{h;d}
x
s/ /\n/g
:
s/0\(0*\)$/X\1/gm
t
s/$/@0123456789/gm
s/\(.\)\(X*\)@.*\(.\)\1.*/\3\2/gm
y/X/9/
/\b0\+\b\n\?/{s///;x;p;x}
x