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- #include <iostream>
- using namespace std;
- int main()
- {
- int n,r=0,p=1;
- cin>>n;
- do
- {
- if(n%10<=5)
- {
- r=r+n%10*p;
- p=p*10;
- }
- n=n/10;
- }
- while(n!=0);
- cout<<r;
- return 0;
- }
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