# your code goes here
#0JLQsNGB0LjQu9C10L3QutC+INCQ0YDRgtC10Lwg
#просте завдання номер 1.4
import math
def prog(ax, ay, bx, by):
ax = int(ax)
bx = int(bx)
ay = int(ay)
by = int(by)
r = math.sqrt((bx-ax)**2+(by-ay)**2 )
print(r)
prog(4,4,1,0)
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