def d(a,b,c)
n=(a<0)^(b<0)
a=-a if n
m=a/b-b/a
l=m.to_s.size-1
g=(a*10**(10+c)/b).to_s
f=m<0?"."+"0"*(l-1)+g[0..c-l-1] : g[0..l]+"."+g[l+1..c-2]
p n ? "-"+f : f
end
d(53228,16943,20)
ZGVmIGQoYSxiLGMpCiAgbj0oYTwwKV4oYjwwKQogIGE9LWEgaWYgbgogIG09YS9iLWIvYQogIGw9bS50b19zLnNpemUtMQogIGc9KGEqMTAqKigxMCtjKS9iKS50b19zCiAgZj1tPDA/Ii4iKyIwIioobC0xKStnWzAuLmMtbC0xXSA6IGdbMC4ubF0rIi4iK2dbbCsxLi5jLTJdCiAgcCBuID8gIi0iK2YgOiBmCmVuZAoKZCg1MzIyOCwxNjk0MywyMCk=