RITA=1000R+100I+10T+A
ITA=100I+10T+A
TA=10T+A
A=A
RITA+ITA+TA+A=1000R+100I+10T+A+100I+10T+A+10T+A+A=
=1000R+200I+30T+4A=7866
4A=16 sau 4A=36 aleg A=36:4=9 deoarece daca A=4 Trezulta nr zecimal
7866-4A=7866-36=7830
30T=30 T =1
7830-30T=7830-30=7800
200I=800 I=4
7800-200I=7000
1000R=7000 R=7
deci
R=7
I=4
T=1
A=9