#include <iostream>
#include <sstream>
#include <unordered_map>
#include <set>
#include <vector>
 
using namespace std;
 
int main() {
    string text, cacheWord, word;
    getline(cin, text);
    getline(cin, cacheWord);
 
    unordered_map<string, int> freqMap;
    set<string> excludedWords;
 
    stringstream ss(cacheWord);
    while (ss >> word) {
        excludedWords.insert(word);
    }
 
    stringstream textStream(text);
    while (textStream >> word) {
        if (excludedWords.find(word) == excludedWords.end()) {
            freqMap[word]++;
        }
    }
 
    string result = "";
    int maxFreq = 0;
 
    for (const auto &entry : freqMap) {
        if (entry.second > maxFreq || (entry.second == maxFreq && entry.first < result)) {
            maxFreq = entry.second;
            result = entry.first;
        }
    }
 
    cout << result << endl;
    return 0;
}

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