View Code of Problem 43

#include<stdio.h>
#include<string.h>
int main(){
	char s1[90],s2[90];
	scanf("%s",s1);
	int i,j = 0;
	for(i = 0;;i ++){
		if(s1[i] != '\0'){
			if((s1[i]>='a' && s1[i] <= 'z') || (s1[i] >= 'A' && s1[i] <='Z')){
				s2[j++] = s1[i];
			}
		}else{
			break;
		}
	}
	s2[j] = '\0';
	strcpy(s1,s2);
	printf("%s",s1);
	return 0;
}