2019多校J Fraction Comparision
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https://ac.nowcoder.com/acm/contest/881/J
用python很容易水过啦，__int128也可以。
while 1:
try:
x,a,y,b=map(int,input().split())
except:
break
#print(x,a,y,b)
d=x*b-y*a
if(d>0):
print('>')
elif(d==0):
print('=')
else:
print('<')