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#include<stdio.h>
#include<string.h>
#define blanc ' '
#define comma ','
#define point '.'
 
int main(){
    int i = ' ', n=0;
    char res = ' ';
  //  *res = '\0';
  //  res[0] = '\0';
    char oldc='0', newc;
    while(i!=EOF){ 
    i=getchar(); newc=i; n++; 
 
    while(newc != '.' && newc != ' ' && newc!= ',') {
            if ((newc >= '0' && newc <= '9') || newc == 'A'){
                if (newc == 'A') newc = 10;
                if (newc >= oldc){
                    if (newc ==10) newc = 'A';
              //   strcat(res, newc);
                res += newc;} else {
                    res = '0';
                    break;
                }
            }
            } if (res != '0') {
            printf ("%c\n", res);
            res = '0';
        }
        }
    }

prog.c: In function ‘main’:
prog.c:16:1: error: stray ‘\302’ in program
     while(newc != '.' && newc != ' ' && newc!= ',') {
 ^
prog.c:16:2: error: stray ‘\240’ in program
     while(newc != '.' && newc != ' ' && newc!= ',') {
  ^
prog.c:16:4: error: stray ‘\302’ in program
     while(newc != '.' && newc != ' ' && newc!= ',') {
    ^
prog.c:16:5: error: stray ‘\240’ in program
     while(newc != '.' && newc != ' ' && newc!= ',') {
     ^

Standard output is empty