input_file = open('sample.txt')
lines = input_file.readlines()
input_file.close()

freq = {}
total = 0

for line in lines:
    for c in line:
        if c not in freq:
            freq[c] = 0
        freq[c] = freq[c] + 1
        total = total + 1

print 'Number of e:', freq['e'], '/', total