Only Alphabet

    #include<stdio.h>
    int main()
    {
        char x[100];
        int i, j;
        printf("Enter a string: ");
        gets(x);
        for(i = 0; x[i] != '\0'; ++i)
        {
            while (!( (x[i] >= 'a' && x[i] <= 'z') || (x[i] >= 'A' && x[i] <= 'Z') || x[i] == '\0') )
            {
                for(j = i; x[j] != '\0'; ++j)
                {
                    x[j] = x[j+1];
                }
                x[j] = '\0';
            }
        }
        printf("Output String: ");
        puts(x);
        return 0;
    }