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Remove all characters in a string except Alphabet

Programme:

#include<stdio.h>

int main()
{
    char line[150];
    int i, j;    
    printf("Enter a string : ");    
    gets(line);
    for(i =0; line[i]!='\0';++i)
    {
        while(!((line[i]>='a'&& line[i]<='z')||(line[i]>='A'&& line[i]<='Z')|| line[i]=='\0'))
        {
            for(j = i; line[j]!='\0';++j)
            {
                line[j]= line[j+1];
            }            
            line[j]='\0';
            }
    }    
        printf("Output String : ");    
        puts(line);
        return 0;
}

Output:

Enter a string : Co53@deS+-po75t                                                                                          
Output String : CodeSpot