11112bignumber

#include <stdio.h>
/* 2016/09/22 */
int first4(int x){
    return x/10000;
}
int last4(int x){
    /* The operator % in C computes the remainder after division.
    For example, the answer of 23%7 will be 2.*/
    return x%10000;
}
int first8(int x){
    return x/100000000;
}
int last8(int x){
    return x%100000000;
}
int shift4(int x){
    return x*10000;
}
int main(void){
    int x;
    int a, b;
    int c1, c2, c3;
    /* Assume that the input is always an 8-digit positive integer. */
    scanf("%d", &x);
    a = first4(x);
    b = last4(x);
    c3 = last4(b*b);
    c2 = last8(2*a*b + first4(b*b) + shift4(last4(a*a)));
    c1 = first4(a*a)+first8(2*a*b + first4(b*b) + shift4(last4(a*a)));
    printf("%4d%08d%04d", c1, c2, c3);
    /* %04d will display a 4-digit number and add 0 as padding before the number if necessary */
    return 0;
}