goback

def go_back_n(frames, window_size):
    sent = 0
    while sent < len(frames):
        print(f"Sending Frames: {frames[sent:sent+window_size]}")
        for i in range(sent, min(sent + window_size, len(frames))):
            ack = input(f"ACK for Frame {i} (y/n): ").strip().lower()
            if ack != 'y':
                print(f"Error in Frame {i}, resending window...")
                break
        else:
            sent += window_size
            continue
        sent = i
    print("All frames sent successfully!")

frames = input("Enter frames to send (comma-separated): ").split(',')
window_size = int(input("Enter window size: "))
go_back_n(frames, window_size)