Problem 1. World Tour

def print_state(stops_info):
    return stops_info


data = input()
stops = " "

while not data == "Travel":
    command = data.split(":")[0]

    if command == "Add Stop":
        index = int(data.split(":")[1])
        next_stop = data.split(":")[2]
        if 0 <= index < len(stops):
            left_side = stops[:index]
            right_side = stops[index:]
            stops = left_side + next_stop + right_side
            print(print_state(stops))

    elif command == "Remove Stop":
        start_index = int(data.split(":")[1])
        end_index = int(data.split(":")[2])
        if 0 <= start_index < len(stops) and 0 <= end_index < len(stops):
            left_side = stops[:start_index]
            right_side = stops[end_index + 1:]
            stops = left_side + right_side
            print(print_state(stops))

    elif command == "Switch":
        old_string = data.split(":")[1]
        new_string = data.split(":")[2]
        if old_string in stops:
            stops = stops.replace(old_string, new_string)
        print(print_state(stops))

    else:
        stops = data

    data = input()

print(f"Ready for world tour! Planned stops: {stops}")