contentX = ['a12334111','b3215555','c444389663']
content = [  12334111,  3215555 , 44489663]      # this OK

a =  content[1]
b = a.to_s[0..3]  # this string need to add
puts 'a:       ' + a.to_s + '  b:  ' + b.to_s

s = content.inject(:+)
s2 = contentX[0..3].inject(:+) #  Error here, no values calculated

puts 'Sum    ' + s.to_s
puts 'Sum2   ' + s2.to_s

Sum2  = 888