#include<stdio.h>

#include<string.h>

#include<string>

#include<iostream>

using namespace std;

class Solution {

public:

int lengthOfLongestSubstring(string s) {

int arr[256];

int maxlen = 0;

for(int i = 0; i < s.length(); i++) {

memset(arr, 0, sizeof(arr));

int j = i;

for(; j < s.length(); j++) {

if(arr[s[j]] != 0)

break;

arr[s[j]]++;

}

if(j - i > maxlen)

maxlen = j - i;

}

return maxlen;

}

};

int main() {

Solution s;

string str = "";

cout << s.lengthOfLongestSubstring(str) << endl;

while(cin >> str){

cout << s.lengthOfLongestSubstring(str) << endl;

}

}