data = []
name = ''
while name != 'done':
    name = input("enter name, or 'done' to finish: ")
    if name != 'done':
        age = int(input("enter age for " + name + ": "))
        data.append([name, age])

def indexOne(x):
    return x[1]

data.sort(key=indexOne)
for element in data:
    print('name: ', element[0], ' age: ', element[1])