Ответ:

a, b = input().split(" ")

a = list(a)

b = list(b)

if a[0] == b[0]:

print("да")

else:

print("нет")

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a, b = input().split(" ")

a = list(a)

b = list(b)

if a[len(a)-1] == b[0]:

print("да")

else:

print("нет")