Initially, there is a Robot at position 0, 0. Given a sequence of its moves, judge if this robot makes a circle, which means it moves back to the original place. The move sequence is represented by a string. And each move is represent by a character. The valid robot moves are R Right, L Left, U Up and D down. The output should be true or false representing whether the robot makes a circle. Example 1: Input: UD Output: true Example 2: Input: LL Output: false
def judge_circle(moves):
    dict_moves = {
        'U' : 0,
        'D' : 0,
        'R' : 0,
        'L' : 0
    }
    for char in moves:
        dict_moves[char] = dict_moves[char] + 1
    return dict_moves['L'] == dict_moves['R'] and dict_moves['U'] == dict_moves['D']
