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#0prec: x is an integer

#postc: returns the first digit of x

def firstDigit(x):

list0 = list(str(x))

return int(list0[0])

print "firstDigit(234643) = ", firstDigit(234643), "expected: 2"

print "firstDigit(4) = ", firstDigit(4), "expected: 4"

print "firstDigit(9999999) = ", firstDigit(9999999), "expected: 9"