mystr = "BEGIN here is some text END BEGIN END"
words = mystr.split()  

k_begin = 0
k_end = 0

print("My string was =")
print(mystr)

for word in words:
    print(f"\nMy word = {word}")
    if word == "BEGIN":
        k_begin += 1
    elif word == "END":
        k_end += 1

B = (k_begin == k_end)

print("B =", B)