Buggy python submission (verdict: Runtime Error):
import sys

sys.setrecursionlimit(10**9)

def f(b, n):
    if n < b:
        return n
    else:
        q, r = divmod(n, b)
        return f(b, q) + r

n = int(input())
s = int(input())
if n == s:
    print(n+1)
else:
    b = 2
    while b*b <= n:
        if f(b, n) == s:
            print(b)
            break
        b += 1
    else:
        p = 1
        ans = 10**13
        while p*p <= n:
            b = (n - s) // p + 1
            if f(b, n) == s:
                ans = min(ans, b)
            p += 1
        if ans == 10**13:
            print(-1)
        else:
            print(ans)

Fixed submission:
def f(b, n):
    if n < b:
        return n
    else:
        q, r = divmod(n, b)
        return f(b, q) + r

n = int(input())
s = int(input())
if n == s:
    print(n+1)
else:
    b = 2
    while b*b <= n:
        if f(b, n) == s:
            print(b)
            break
        b += 1
    else:
        p = 1
        ans = 10**13
        while p*p <= n:
            b = (n - s) // p + 1
            if p < b and s - p < b and f(b, n) == s:
                ans = min(ans, b)
            p += 1
        if ans == 10**13:
            print(-1)
        else:
            print(ans)

Buggy python submission (verdict: Runtime Error):
import sys

sys.setrecursionlimit(10000)

def f(b, n):
    if n < b:
        return n
    else:
        q, r = divmod(n, b)
        return f(b, q) + r

n = int(input())
s = int(input())
if n == s:
    print(n+1)
else:
    b = 2
    while b*b <= n:
        if f(b, n) == s:
            print(b)
            break
        b += 1
    else:
        p = 1
        ans = 10**13
        while p*p <= n:
            b = (n - s) // p + 1
            if f(b, n) == s:
                ans = min(ans, b)
            p += 1
        if ans == 10**13:
            print(-1)
        else:
            print(ans)

Fixed submission:
def f(b, n):
    if n < b:
        return n
    else:
        q, r = divmod(n, b)
        return f(b, q) + r

n = int(input())
s = int(input())
if n == s:
    print(n+1)
else:
    b = 2
    while b*b <= n:
        if f(b, n) == s:
            print(b)
            break
        b += 1
    else:
        p = 1
        ans = 10**13
        while p*p <= n:
            b = (n - s) // p + 1
            if p < b and s - p < b and f(b, n) == s:
                ans = min(ans, b)
            p += 1
        if ans == 10**13:
            print(-1)
        else:
            print(ans)

Buggy python submission (verdict: Runtime Error):
def f(b, n):
    if n < b:
        return n
    else:
        q, r = divmod(n, b)
        return f(b, q) + r

n = int(input())
s = int(input())
if n == s:
    print(n+1)
else:
    b = 2
    while b*b <= n:
        if f(b, n) == s:
            print(b)
            break
        b += 1
    else:
        p = 1
        ans = 10**13
        while p*p <= n:
            b = (n - s) // p + 1
            if f(b, n) == s:
                ans = min(ans, b)
            p += 1
        if ans == 10**13:
            print(-1)
        else:
            print(ans)

Fixed submission:
def f(b, n):
    if n < b:
        return n
    else:
        q, r = divmod(n, b)
        return f(b, q) + r

n = int(input())
s = int(input())
if n == s:
    print(n+1)
else:
    b = 2
    while b*b <= n:
        if f(b, n) == s:
            print(b)
            break
        b += 1
    else:
        p = 1
        ans = 10**13
        while p*p <= n:
            b = (n - s) // p + 1
            if p < b and s - p < b and f(b, n) == s:
                ans = min(ans, b)
            p += 1
        if ans == 10**13:
            print(-1)
        else:
            print(ans)