Cases to find maximum number of digits to be removed
if ( zero > 0 ) System . out . print ( N - 1 + " ▁ " ) ; else if ( one > 0 && two > 0 ) System . out . print ( N - 2 + " ▁ " ) ; else if ( one > 2 two > 2 ) System . out . print ( N - 3 + " ▁ " ) ; else System . out . print ( - 1 + " ▁ " ) ; }