7、Convert the fraction $\frac{5}{7}$ into a decimal, then the sum of all digits from the 1st to the 100th position after the decimal point is $\qquad$

Convert the fraction $\frac{5}{7}$ into a decimal, then the sum of all digits from the 1st to the 100th position after the decimal point is $\qquad$
【Analysis】 $\frac{5}{7}=0 . \dot{7} 1425 \dot{8}, 100 \div 6=16 \cdots 4$,
so the sum of the 100 digits after the decimal point is $(7)+1+4+2+8+5 \times 16+7+1+4+2=446$.