How can i draw the flowchart related on this problem?

If the input is 455231, the output should be 4231, 55, "tie" because 4+3+2+1 = 5+5

If the input is 53314, the output should be 3314, 5, "First one is heavier" because 3+3+1+4 is bigger than 5

If the input is 55531, the output should be 31, 555, "Second is heavier" because 5+5+5 is bigger than 3+1

Thank you

Please do not use arrays, strings or concatenation.

and what is the pre, post condition for this problem?