def main():
    S, T, c = input().split()
    S = int(input())
    T = int(input())
    if c == "<":
        print("YES" if S < T else "NO")
    elif c == ">":
        print("YES" if S > T else "NO")
    else:
        print("YES" if S == T else "NO")

if __name__ == "__main__":
    main()