Find sum of digits of D.
A= 19991999
B = sum of digits of A
C = sum of digits of B
D = sum of digits of C
A= 19991999
B = sum of digits of A
C = sum of digits of B
D = sum of digits of C
2
A=B=C=D=2
B=56
C=11
D=2
yes ans is 2
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