from collections import defaultdict

def can_sort_with_k_swaps(N, K, S, T):
    s_groups = defaultdict(list)
    t_groups = defaultdict(list)

    for i in range(N):
        s_groups[i % K].append(S[i])
        t_groups[i % K].append(T[i])

    for r in range(K):
        if sorted(s_groups[r]) != sorted(t_groups[r]):
            return False
    return True

def main():
    import sys
    input = sys.stdin.read
    data = input().split()

    N = int(data[0])
    K = int(data[1])
    S = data[2:N+2]
    T = data[N+2:]

    print("Yes" if can_sort_with_k_swaps(N, K, S, T) else "No")

main()