Enter the length of three sides of the triangle through the user, and calculate the area of the triangle, where the length is a real number

#
#  main.py
#  Some Python Program
#
#  Created by Mewlan Musajan on 4/29/21.
#

g = int(input('UZUNLUQ 1: '))
b = int(input('UZUNLUQ 2: '))
a = int(input('UZUNLUQ 3: '))



def isLengthValid():
    global g
    global b
    global a
    while g+b<a or g+a<b or b+a<g:
        print('TEREP UZUNLUQLIRI ÜCHBULUNG HASIL QILAMMIDI, QAYTA KIRGÜZÜNG')
        g = int(input('UZUNLUQ 1: '))
        b = int(input('UZUNLUQ 2: '))
        a = int(input('UZUNLUQ 3: '))
	
isLengthValid()
v = (g + b + a) / 2
m = (v*(v-g)*(v-b)*(v-a)) ** 0.5

print('ÜCHBULUNGNING YÜZI %0.5f' %m)