def f(n):
if n < 2 or n == 4:
return False
elif n == 2 or n == 3 or n == 5:
return True
for i in range(2, int(n/2)+1):
if n % i == 0:
return False
return True
a = list(range(4, 21, 2))
for i in a:
for j in range(2, i):
if f(j) and f(i - j):
print(str(i)+':'+str(j)+'+'+str(i-j))
break
continue
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