As title, the final evaluation result is 80 points, can't get full marks, is where there is no notice? Thank you for the guidance of ~

 # include 
Int main () {
Char a, [15]. 
Int I, sum=0, j=1; 
The scanf (" % s ", & amp; A); 
for(i=0; i<11. I++) {
If (a [I] & gt;='0' & amp; & A [I] <='9') {
The sum +=(a [I] - '0') * j; 
j++; 
} 
} 

If (sum % 11==(a [12] - '0')) {
Printf (" Right "); 
} else if (sum % 11!=10) {
A [12]=sum % 11 + '0'; 
for(i=0; i<13; I++) {

Printf (" % c ", a [I]); 
} 

} 
The else {
A [12]='X'; 
for(i=0; i<13; I++) {

Printf (" % c ", a [I]); 
} 
} 
printf("\n"); 

return 0; 
}