#include <bits/stdc++.h>
using namespace std;
 
int main() {
 
string s;
getline(cin,s);
 
 int n=s.size(),idx=0;
 cout<<"old size"<<n<<endl;
        for(int i=0;i<n;i++)
        {
            if(isalnum(s[i]))
            {
            s[idx++]=s[i];
 
            }
 
        }
 
        s.erase(idx,n-idx);
        transform(s.begin(), s.end(), s.begin(), ::tolower); 
        n=s.size();
        cout<<"new size"<<n<<endl;
        cout<<s<<endl;
 
return 0;
 
}

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A man, a plan, a canal: Panama