# Define a procedure, find_element,
# that takes as its inputs a list
# and a value of any type, and
# returns the index of the first
# element in the input list that
# matches the value.

# If there is no matching element,
# return -1.

def find_element(lista, element):
    j = 0
    for i in lista:
        if i == element:
            return j
        j = j+1
    return -1



print find_element([1,2,3],3)
#>>> 2

print find_element(['alpha','beta'],'gamma')
#>>> -1
