Namespaces

def f(dict, var, foom):
    try:
        if var in dict[foom]['var']:
            return foom
        else:
            return f(dict, var, dict[foom]['parent'])
    except KeyError:
        return None
n = int(input())
dict_namespaces = {'global': {'var': [], 'parent': None}}
for i in range(n):
    input_data = input().split()
    if input_data[0] == 'create':
        dict_namespaces[input_data[1]] = {'var': [], 'parent': input_data[2]}
    if input_data[0] == 'add':
        try:
            dict_namespaces[input_data[1]]['var'].append(input_data[2])
        except KeyError:
            print("Key \'var\' does't exist in \'", input_data[2], "\'")
            continue
    if input_data[0] == 'get':
        print(f(dict_namespaces, input_data[2], input_data[1]))