def is_second_string_subsequence_of_first_string(first, second):
i = 0
j = 0
while i < len(first):
if j >= len(second):
return False
if first[i] == second[j]:
print("first[i] =", first[i], "second[j] =", second[j], "i =", i, "j =", j)
i += 1
j += 1
return True
first = "python programming"
second = "python pro programming"
print("yes" if is_second_string_subsequence_of_first_string(first, second) else "no")
'''
run:
first[i] = p second[j] = p i = 0 j = 0
first[i] = y second[j] = y i = 1 j = 1
first[i] = t second[j] = t i = 2 j = 2
first[i] = h second[j] = h i = 3 j = 3
first[i] = o second[j] = o i = 4 j = 4
first[i] = n second[j] = n i = 5 j = 5
first[i] = second[j] = i = 6 j = 6
first[i] = p second[j] = p i = 7 j = 7
first[i] = r second[j] = r i = 8 j = 8
first[i] = o second[j] = o i = 9 j = 9
first[i] = g second[j] = g i = 10 j = 14
first[i] = r second[j] = r i = 11 j = 15
first[i] = a second[j] = a i = 12 j = 16
first[i] = m second[j] = m i = 13 j = 17
first[i] = m second[j] = m i = 14 j = 18
first[i] = i second[j] = i i = 15 j = 19
first[i] = n second[j] = n i = 16 j = 20
first[i] = g second[j] = g i = 17 j = 21
yes
'''
