import time
a = "Hard"
b = "Times" 

def foo(a,b,c,d,depth):
	time.sleep(2)
	print(a,b,c,d,depth)
	if (depth == 3):
		time.sleep(1)
		return a + b + c +d

	return foo(a,b, a[depth], b[depth], depth+1)

x = foo(a,b,a,b,0)
print(x)