#!/usr/bin/env python3

if __name__ == '__main__':
    with open('input','r',encoding='utf-8') as file:
        all_programs = file.readlines()
        i = 0
        for program in all_programs:
            program = program.split()
            program[1] = int(program[1].strip('()'))
            if len(program) > 2:
                program[2] = []
                for j in range(3, len(program)):
                    program[2].append(program[j].strip(','))
                program = [program[0], program[1], program[2]]
            else:
                program.append([])
            all_programs[i] = program
            i += 1
    # at this point, each line is one program in the stack,
    # and each line is a list of info.
    # list[0] is the program name.
    # list[1] is the program weight.
    # list[2] is a list of other programs which sit directly on top.
    # for part 1, we simply need to find the program name
    # which exists in no other list of children!

    # the datatype of all_programs is
    # [[string,int,[string, string,...]],[string,int,[string,string,...],...]

    def find_position(programs_list):
        all_children = ['']
        for program in programs_list:
            if len(program) == 2:
                program = program.append("top")
            else:
                children = program[2]
                if all_children == ['']:
                    all_children = children
                else:
                    all_children = all_children + children
        # note: all_children will not have duplicates!
        #         why? can't stand on two programs' heads at once....
        for program in programs_list:
            try:
                all_children.index(program[0])
            except ValueError:
                program = program.append("bot")
        for program in programs_list:
            if len(program) == 3:
                program = program.append("mid")

    find_position(all_programs)

    i = 0
    for program in all_programs:
        if program[3] == "bot":
            bot_index = i
        i += 1
    bot_name = all_programs[bot_index][0]
    print(bot_name)