calculate_cnange.py

price = float(input())
paid_price = float(input())

change = (paid_price - price)*100

if change >= 0:
    num_lev = change // 100
    change %= 100
    if num_lev:
        print(f'{int(num_lev)} x 1 lev')

    num_petdeset_st = change // 50
    change %= 50
    if num_petdeset_st:
        print(f'{int(num_petdeset_st)} x 50 stotinki')

    num_dvadeset_st= change // 20
    change %= 20
    if num_dvadeset_st:
        print(f'{int(num_dvadeset_st)} x 20 stotinki')

    num_deset_st = change // 10
    change %= 10
    if num_deset_st:
        print(f'{int(num_deset_st)} x 10 stotinki')

    num_pet_st = change // 5
    change %= 5
    if num_pet_st:
        print(f'{int(num_pet_st)} x 5 stotinki')
    num_dve_st = change // 2
    change %= 2
    if num_dve_st:
        print(f'{int(num_dve_st)} x 2 stotinki')
    num_edna_st = change // 1
    change %= 1
    if num_edna_st:
        print(f'{int(num_edna_st)} x 1 stotinka')