Delete number from a string.c

#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);
    printf("%d",i);
    return 0;
}