import math
a= float(input())
b = float(input())
r = math.atan2(a,b)
d = math.degrees(r)
print(int(round(d)),chr(176),sep="")

import math
AB = float(input())
BC = float(input())
rad = math.atan(AB/BC)
deg = math.degrees(rad)
print(int(round(deg)),chr(176),sep='')

from math import sqrt, cos, acos, asin, sin, degrees

ab = float(input())
bc = float(input())

# Pythagoras theorem
ac = sqrt(ab**2 + bc**2)
mc = ac/2

# definition of cos and sin, delta is angle ACB
cos_delta = bc/ac
sin_delta = ab/ac

# law of cosines to find mb
mb = sqrt(bc**2 + mc**2 - 2*bc*mc*cos_delta)

# law of sines to find sin_theta
sin_theta = (mc*sin_delta)/mb

print(f"{round(degrees(asin(sin_theta)))}\N{DEGREE SIGN}")