#include <stdio.h>
#include <stdlib.h>

char * select(char * str);

int main(){
    char entered[255] = "";
    char * selected = NULL;

    printf("Enter ur string: ");
    fflush(stdin);
    scanf("%254[^\n]s",entered);

    selected = select(entered);
    printf("%s", selected);

    return 0;
}

char * select(char * str){
    char * temp = NULL;
    int i=0,j=0;

    while(*(str+i) != '\0'){
        if(*(str+i)>='A' && *(str+i)<='Z'){
            if(i==0 || *(str+(i-1))==' ' || *(str+(i-1))=='\t'){
                while(1){
                    temp = (char *)realloc(temp, (j+1)*sizeof(char));
                    *(temp+j) = *(str+i);
                    i++;
                    j++;

                    if(*(str+i)==' ' || *(str+i)=='\0' || *(str+i)=='\t')
                        break;
                }
            }
        }
        else
            i++;
    }
    *(temp+j) = '\0';
    return temp;
}