ax = float(input())
ay = float(input())
bx = float(input())
by = float(input())
dist = (((bx - ax) ** 2) + ((by - ay) ** 2)) ** 0.5
print(round(dist,2))
65eb89e294bdebe0827964c8164d725ec166764b
<mask token>

<mask token>
print(round(dist, 2))

ax = float(input())
ay = float(input())
bx = float(input())
by = float(input())
dist = ((bx - ax) ** 2 + (by - ay) ** 2) ** 0.5
print(round(dist, 2))

ax = float(input())
ay = float(input())
bx = float(input())
by = float(input())
dist = (((bx - ax) ** 2) + ((by - ay) ** 2)) ** 0.5
print(round(dist,2))