file = open(filename)
    someDict = {}

    someDict['T'] = Symbol('T', 0, '')
    someDict['A'] = Symbol('A', 0, '')
    someDict['G'] = Symbol('G', 0, '')
    someDict['C'] = Symbol('C', 0, '')
    for line in file:
        someStr = line.strip()
        for i in someStr:
            someDict[i].freq += 1

    return someDict