A. Fox And Snake Solution

#include<stdio.h>

int main(){

    int row,col,i,j;

    scanf("%d%d",&row,&col);

    for (i=1;i<=row;i++){

        for (j=1;j<=col;j++){

            if (i%2==1)

                printf("#");

            else {

                if ((i-2)%4==0){

                    if(j==col)

                        printf("#");

                    else

                        printf(".");

                }

                else {

                    if (j==1)

                        printf("#");

                    else

                        printf(".");

                }

            }

        }

        printf("\n");

    }

    return 0;

}