C scanf () problem

I am new to C and cannot let my life determine what I'm doing wrong here. The first scanf works fine, variables print when they are read. The second scanf doesn't seem to read the input correctly. The input has the format "char int int", i.e. B 4 4
when I print opb x and y out, opb = "", x = 13238272, y = 0. Any ideas? ..... please note that cut the code below the problem

int main(void)
{

/*initialize variables*/
int width, height;
char op;

/*grid input*/
scanf("%c %d %d", &op, &width, &height);

/*check conditions*/
if (op != 'g' || width>100 || height>100 || width*height<10 || width<1 || height<1) {
    printf("grid-error\n");
    return 0;
}

/*initialize grid elements*/
int grid[width][height];
char printGrid[width][height];

/*create grid elements*/
int i, j;
for (i=0; i<height; i++) {
    for (j=0; j<width; j++) {
        grid[j][i] = 0;
        printGrid[j][i] = '*';
    }
}

/*print successful creation*/
printf("%c %d %d \n", op, width, height);

int k;
for (k = 0; k<10; k++) {
    /*initialize variables*/
    int x, y;
    char opb;

    /*mine input*/
    scanf("%c %d %d", &opb, &x, &y);

    /*check conditions*/
    if (opb != 'b' || x<0 || y<0 || x>(width-1) || y>(height-1) || grid[x][y] == 9) {
        printf("mine-error\n");
        return 0;
    }