for _ in range(int(input())):
n = int(input())
arr = list(map(int,input().split()))[:n]
b = 0
c = 0
d = 0
e = 0
f = 0
for i in range(n):
if arr[i] == 1:
d += 1
else:
if arr[i] == 2:
c += 1
e += arr[i]
f += 1
if arr[i]%2 != 0:
b += 1
if d == 1:
if b%2 == 0:
print("CHEF")
continue
if c == 0:
print("CHEFINA")
continue
e -= 2
f -= 1
if (e-f)%2 != 0:
print("CHEFINA")
continue
else:
print("CHEF")
continue
elif d>1:
if (e-f)%2 != 0:
print("CHEF")
continue
else:
print("CHEFINA")
continue
if b%2 != 0:
print("CHEF")
continue
else:
print("CHEFINA")
continue