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class UserMainCode(object):
    @classmethod
    def getPattern(cls, input1, input2):
        # Create a dictionary to store the counts of characters in the pattern
        pattern_dict = {}
        for char in input2:
            pattern_dict[char.lower()] = pattern_dict.get(char.lower(), 0) + 1
        
        # Initialize variables
        start = 0
        min_length = float('inf')
        min_substring = ""
        unique_chars_covered = 0
        current_substring = {}

        for end in range(len(input1)):
            char = input1[end].lower()

            if char in pattern_dict:
                current_substring[char] = current_substring.get(char, 0) + 1

                if current_substring[char] == pattern_dict[char]:
                    unique_chars_covered += 1
            
            while unique_chars_covered == len(pattern_dict):
                if end - start + 1 < min_length:
                    min_length = end - start + 1
                    min_substring = input1[start:end + 1]
                
                char = input1[start].lower()

                if char in pattern_dict:
                    current_substring[char] -= 1

                    if current_substring[char] < pattern_dict[char]:
                        unique_chars_covered -= 1
                
                start += 1
        
        return min_substring