#include <stdio.h>
#include <stdlib.h>
#include <ctype.h>
int main() {
    char c;
    int i=-1, ar=0, sb=0, se, fl=0, j;
    FILE *f;
    f = fopen("in.txt","r");
    if (!f) {printf("Erro occuring opening file"); return 1; }
    while(!feof(f)) {
        i++;
        c = fgetc(f);
        if (!isalpha(c) && !fl) continue; else {fl=1;sb=i;}
        if (c == '!' || c == '?' || c == '.') {
            se = i;
            for(j=sb;j<se;j++) {
                fseek(f,j,0);
                c = fgetc(f);
                printf("%c",c);
            }
            fseek(f,i,0);
            sb = se + 2;
        }
    }
    fclose(f);
    return 0;
}