#include <iostream>
#include <string>
using namespace std;


  
int main(){
    int getCommonStrLength(string s1,string s2);
    string s,str1,str2;
    getline(cin,s);
    int pos=s.find(' ');//儲存第一個空格的位置
    int len=s.length();
    //while(s[++position]!=' '&&position<len);
    str1 = s.substr(0,pos);
    str2 = s.substr(pos+1,len-pos-1);
    cout<<getCommonStrLength(str1,str2)<<endl;
    return 0;
    
}


int getCommonStrLength(string s1,string s2){
    int count=0;
    int len1 = s1.length();
    int len2 = s2.length();
    
    //將st1中所有的字母變小寫  
    for(i=0;i<len1;i++)  
    {  
        if(isupper(s1[i]))  
            s1[i]=tolower(s1[i]);  
  
    }  
    i=0;  
    //將st2中所有的字母變小寫  
    for(j=0;j<len2;j++)  
    {  
        if(isupper(s2[j]))  
            s2[j]=tolower(s2[j]);  
  
    }  
    
    if(s1==" "||s2==" ")return 0;
    for(int i=0;i<len1;i++){
      for(int j=0;j<len2;j++){
        int number=0;
        if(i==len1||j==len2){break;}
        while(s1[i]==s2[j]){
          i++;j++;
          number++;
          count=count>number?count:number;
          if(i==len1||j==len2){break;}
          if(count==len1||count==len2)return count;
        }
      }
    }
    return count;
}