#include <iostream>
#include <string>
using namespace std;
int main()
{
string s;
cin>>s;
int k=0,n=0,a;
for(int i=0;i<s.length()+1;i++)
{
if(n<k) n=k;
if(isdigit(s[i])) k=k+1;
else k=0;
}
for(int i=s.length();i>=-1;i--)
{
if(k==n) a=i+1;
if(isdigit(s[i])) k=k+1;
else k=0;
}
for(int i=a;i<a+n;i++)
{
cout<<s[i];
}
return 0;
}
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