scan input string and store words in array in C -

i writing c program in want scan user given input this:

"hello how you" (one single line without quotes)

and each of word should in user defined array like
a[0]=hello
a[1]=how
a[2]=are
a[3]=you

    j=0;     for(i=0;i<4;i++)     {         scanf("%s",&a[j][i]);     }

here function using print contents of array

for(i=0;i<2;i++)     for(j=0;j<4;j++)         printf("%s\t",a[i][j]);

getting run time error

since want store two-dimensional char array. code should like

  char a[4][10];   for(i=0;i<4;++i){     gets(a[i]);   }

it 4 strings , store them in different rows.

and can accessed in same way mentioned

MOno