题解 | 迷路的牛牛

import sys

n = int(input())
turns = input().strip()

direction = 0  # 初始方向：0-N, 1-E, 2-S, 3-W

for turn in turns:
    if turn == "L":
        direction = (direction - 1) % 4
    else:
        direction = (direction + 1) % 4

# 映射方向数字到字母
direction_map = {0: "N", 1: "E", 2: "S", 3: "W"}
print(direction_map[direction])