Hypotheticly a is the first number, b the second and c the last one.
a=9999, c=2a
a+b+c=100 000
if a+1=10 000 (no letter) then c= 2×(a+1-1)=2×(a+1)-2 so
a+1+b+2×(a+1)-2=100 000
b=72 000
the second number is as good as 72 000
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