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import random
from tkinter import *

root = Tk()
e = Entry(root)
e.pack()
e.focus_set()
#########
a = 5
b = "2"
c = a + int(b)
d = random.randrange(1, 100)
f = c * d
#########
var = IntVar()
e.config(textvariable=var)
var.set(f)
mainloop()