Stop iphone keyboard from automatically switching to text when typing numbers (with spaces).

Please - help me stop the iphone keyboard from automatically switching back to text when I'd like to stay on the numbers display "after hitting the space bar."

So if I type 76 76 76 76 "with spaces as demonstrated" I want to stop the iphone keyboard from automatically going back to text after hitting the space bar for a space between each "76" ,

... IOW I don't want the iphone keyboard to "automatically" switch between the numbers and text - when typing numbers, I want to manually tap the "ABC" key to switch text no matter how many times I press the space bar when typing numbers.